Table 3.

Immunoreactivity of different neuronal markers in the ventral and dorsal sides of the PLL

Neuronal markers (x ± s, n = 932)	Ventral side	Dorsal side	P-value
SP	27.6 ± 6.2	18.6 ± 5.2	< 0.0001*
CGRP	30.5 ± 6.3	21.2 ± 5.1	< 0.0001*
β3-tubulin	39.4 ± 7.6	38.1 ± 7.4	0.47

*P < 0.05, the difference was statistically significant. PLL posterior longitudinal ligament